Represents the amount of interest income (expense) on interest rate swap.

No definition available.

Name:	gsbc_DerivativeInterestRateSwapInterestIncomeExpense
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the amount of interest income on terminated interest rate swap.

+ References

No definition available.

+ Details

Name:	gsbc_DerivativeInterestRateSwapTerminatedInterestIncome
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of terminated value of derivatives.

+ References

No definition available.

+ Details

Name:	gsbc_DerivativeTerminationNotionalAmount
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of interest income expected upon termination of a derivative contract.

+ References

No definition available.

+ Details

Name:	gsbc_DerivativeTerminationValueExpectedInterestIncome
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of derivative termination value loan interest income.

+ References

No definition available.

+ Details

Name:	gsbc_DerivativeTerminationValueLoanInterestIncome
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

It represents the amount of non interest income changes in fair value.

+ References

No definition available.

+ Details

Name:	gsbc_NonInterestIncomeChangesInFairValue
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage of USD-prime rate.

+ References

No definition available.

+ Details

Name:	gsbc_UsdPrimeRate
Namespace Prefix:	gsbc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of USD-SOFR OIS rate.

+ References

No definition available.

+ Details

Name:	gsbc_UsdSofrOisRate
Namespace Prefix:	gsbc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
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+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
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Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=gsbc_InterestRateSwapOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Period Type:

- Details

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DERIVATIVES AND HEDGING ACTIVITIES - Cash Flow Hedges (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Jul. 31, 2022	Mar. 31, 2022	Oct. 31, 2018
DERIVATIVES AND HEDGING ACTIVITIES
USD-Prime rate				7.50%
USD-SOFR OIS rate				4.31926%
Non-interest income related to changes in the fair value		$ 0	$ 0	$ 0	$ 0
Interest rate swaps \| Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Total notional amount of the swaps							$ 300,000,000	$ 400,000,000
Derivative, fixed interest rate							1.6725%	3.018%
Terminated notional amount of derivatives	$ 400,000,000
Expected interest income on termination	$ 45,900,000
Loan interest income on terminated interest rate swap		2,000,000	2,000,000	4,000,000	4,100,000
Terminated interest rate swap					1,900,000
Interest rate swap one \| Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Total notional amount of the swaps						$ 200,000,000
Derivative, fixed interest rate						2.628%
Interest rate swap two \| Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Total notional amount of the swaps						$ 200,000,000
Derivative, fixed interest rate						5.725%
July 2022 interest rate swaps \| Cash flow hedges
DERIVATIVES AND HEDGING ACTIVITIES
Loan interest income expense		$ 1,800,000	$ 2,800,000	$ 3,500,000	$ 5,500,000